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UK summer raising my tank temperature

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I keep my 125 litre tank at 25'c, however the summer we are having in the UK has been making the temps rise to 27 - 28'c. However, I just checked and my tank is at 29.7'c. This is worrying me, my fish all seem fine and arent stressed or anything, but im worried that prolonged expose to these temps will hurt them in the long run.

The fish I have are in my sig, will they be ok at these temps? And if not is there anything I can do to keep the tank cooler? (I cant risk removing my lid as I have a betta and I dont want him jumping out).

If you have a cover on the tank try taking it off, you can also try a small fan blowing across the top of the tank. Another option is to turn down the temp on the heat to compensate for the rise in temperature.

As I said in my post I dont want to remove the lid as bettas are known to jump, no way im risking it, which means I also cant have a fan over the water surface (which is impracticable given where the tank is located anyway).

I have the heated turned off, it makes no difference as the room is heating the tank not the heater.

When we had that big heat wave here, I had a fan blow into the area where the tank is, with some large jugs of water frozen solid behind it, to act as a bit of an AC unit. Maybe freeze some dechlorinated water in tupperware (or the like), and float that in the tank? Or put some dechlorinated ice in the filter?

Didn't read the post that close sorry, I would try flybys ideas I would go with the AC first then try the ice cube. There might be problems with uneven heating with the ice cube. I'm really not sure what else to suggest sorry.

I think you'll be ok as long as your temp changes aren't too sudden - my tanks sit at around 32c daytime during summer and drop to 24-25c during the night with no ill effects, day/night difference not as large during winter

Just make sure your oxygenation is ok and your fish should be ok. Adding ice is only a very short term solution and your fish may be better off with steady high temperature rather than fluctuations. I'm in the UK and my tanks are ranging 26-28 at the moment (heater set to 24 so it isn't even kicking in).